Just undo the inline barrel adjuster a little. It should be next to the gear shifter, which means you can wind it out a half-turn while you're riding along.

If it's not there, it will be next to the derailleur.

If it takes more than 1 turn, you'll need to delve a little deeper. Check out the Shimano web site for an installation instruction on a derailleur. You should also be able to find good instruction on the Park Tools web site. (edit: ... as linked to by Needsapush ....)

Cheers,
Graeme

Think outside the double triangle.---------------------Music was better when ugly people were allowed to make it ....

Sorry, just got back, anyway the advice you've been given is good. Get down behind the bike (in line with the cogs and the mech) and have a good squizz at what happens when you shift the barrel adjuster, paying particular attention to lining up the mech cage (below) with the cogs.

Also, examine your cable run carefully, often when a change is slow or sticky it can be that the cable run is impeded by crud, lack of lubrication, worn cable or cable outer.

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